Both theories have been considered the accepted expert consensus at different points in time. My position is that both are equally founded in verifiable proof. Logic informs us that neither theory can be verified so the correct position would be that the purpose may be unknown or unknowable.
edit to add: it’s the difference between teaching that the purpose of the great pyramids is unknown but we suspect they were tombs and teaching that there are tombs.
Try reading instead of skimming. I’ve stated many times that I do not believe it was ever used for grain storage. Or, have I fallen victim to your driving trollies?